2 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <svm/fifo_segment.h>
19 fsh_alloc_aligned (fifo_segment_header_t *fsh, uword size, uword align)
21 uword cur_pos, cur_pos_align, new_pos;
23 cur_pos = clib_atomic_load_relax_n (&fsh->byte_index);
24 cur_pos_align = round_pow2_u64 (cur_pos, align);
25 size = round_pow2_u64 (size, align);
26 new_pos = cur_pos_align + size;
28 if (new_pos >= fsh->max_byte_index)
31 while (!clib_atomic_cmp_and_swap_acq_relax (&fsh->byte_index, &cur_pos,
32 &new_pos, 1 /* weak */))
34 cur_pos_align = round_pow2_u64 (cur_pos, align);
35 new_pos = cur_pos_align + size;
36 if (new_pos >= fsh->max_byte_index)
39 return uword_to_pointer ((u8 *) fsh + cur_pos_align, void *);
43 fsh_alloc (fifo_segment_header_t *fsh, uword size)
45 return fsh_alloc_aligned (fsh, size, 8);
48 static inline fifo_segment_slice_t *
49 fsh_slice_get (fifo_segment_header_t * fsh, u32 slice_index)
51 return &fsh->slices[slice_index];
54 static char *fifo_segment_mem_status_strings[] = {
55 #define _(sym,str) str,
56 foreach_segment_mem_status
61 fsh_n_free_bytes (fifo_segment_header_t * fsh)
63 uword cur_pos = clib_atomic_load_relax_n (&fsh->byte_index);
64 ASSERT (fsh->max_byte_index > cur_pos);
65 return fsh->max_byte_index - cur_pos;
69 fsh_cached_bytes_add (fifo_segment_header_t * fsh, uword size)
71 clib_atomic_fetch_add_rel (&fsh->n_cached_bytes, size);
75 fsh_cached_bytes_sub (fifo_segment_header_t * fsh, uword size)
77 clib_atomic_fetch_sub_rel (&fsh->n_cached_bytes, size);
81 fsh_n_cached_bytes (fifo_segment_header_t * fsh)
83 uword n_cached = clib_atomic_load_relax_n (&fsh->n_cached_bytes);
88 fsh_active_fifos_update (fifo_segment_header_t * fsh, int inc)
90 clib_atomic_fetch_add_rel (&fsh->n_active_fifos, inc);
94 fsh_n_active_fifos (fifo_segment_header_t * fsh)
96 return clib_atomic_load_relax_n (&fsh->n_active_fifos);
100 fsh_virtual_mem (fifo_segment_header_t * fsh)
102 fifo_segment_slice_t *fss;
106 for (i = 0; i < fsh->n_slices; i++)
108 fss = fsh_slice_get (fsh, i);
109 total_vm += clib_atomic_load_relax_n (&fss->virtual_mem);
115 fsh_virtual_mem_update (fifo_segment_header_t * fsh, u32 slice_index,
118 fifo_segment_slice_t *fss = fsh_slice_get (fsh, slice_index);
119 fss->virtual_mem += n_bytes;
123 fss_chunk_freelist_lock (fifo_segment_slice_t *fss)
126 while (!clib_atomic_cmp_and_swap_acq_relax_n (&fss->chunk_lock, &free, 1, 0))
128 /* atomic load limits number of compare_exchange executions */
129 while (clib_atomic_load_relax_n (&fss->chunk_lock))
131 /* on failure, compare_exchange writes (*p)->lock into free */
137 fss_chunk_freelist_unlock (fifo_segment_slice_t *fss)
139 /* Make sure all reads/writes are complete before releasing the lock */
140 clib_atomic_release (&fss->chunk_lock);
144 fss_chunk_fl_index_is_valid (fifo_segment_slice_t * fss, u32 fl_index)
146 return (fl_index < fss->n_chunk_lens);
150 fss_chunk_free_list_push (fifo_segment_slice_t * fss, u32 fl_index,
151 svm_fifo_chunk_t * c)
153 fss_chunk_freelist_lock (fss);
154 c->next = fss->free_chunks[fl_index];
155 fss->free_chunks[fl_index] = c;
156 fss_chunk_freelist_unlock (fss);
160 fss_chunk_free_list_push_list (fifo_segment_slice_t * fss, u32 fl_index,
161 svm_fifo_chunk_t * head,
162 svm_fifo_chunk_t * tail)
164 fss_chunk_freelist_lock (fss);
165 tail->next = fss->free_chunks[fl_index];
166 fss->free_chunks[fl_index] = head;
167 fss_chunk_freelist_unlock (fss);
170 static svm_fifo_chunk_t *
171 fss_chunk_free_list_pop (fifo_segment_slice_t * fss, u32 fl_index)
175 ASSERT (fss_chunk_fl_index_is_valid (fss, fl_index));
177 fss_chunk_freelist_lock (fss);
179 if (!fss->free_chunks[fl_index])
181 fss_chunk_freelist_unlock (fss);
185 c = fss->free_chunks[fl_index];
186 fss->free_chunks[fl_index] = c->next;
188 fss_chunk_freelist_unlock (fss);
194 fss_fifo_add_active_list (fifo_segment_slice_t * fss, svm_fifo_t * f)
198 fss->fifos->prev = f;
199 f->next = fss->fifos;
205 fss_fifo_del_active_list (fifo_segment_slice_t * fss, svm_fifo_t * f)
207 if (f->flags & SVM_FIFO_F_LL_TRACKED)
210 f->prev->next = f->next;
212 fss->fifos = f->next;
214 f->next->prev = f->prev;
219 fss_fl_chunk_bytes (fifo_segment_slice_t * fss)
221 return clib_atomic_load_relax_n (&fss->n_fl_chunk_bytes);
225 fss_fl_chunk_bytes_add (fifo_segment_slice_t * fss, uword size)
227 clib_atomic_fetch_add_relax (&fss->n_fl_chunk_bytes, size);
231 fss_fl_chunk_bytes_sub (fifo_segment_slice_t * fss, uword size)
233 clib_atomic_fetch_sub_relax (&fss->n_fl_chunk_bytes, size);
237 * Initialize fifo segment shared header
240 fifo_segment_init (fifo_segment_t * fs)
242 u32 max_chunk_sz, align = 8, offset = 2 * 4096, vec_sz;
243 uword max_fifo, seg_start, seg_size;
244 fifo_segment_header_t *fsh;
245 fifo_segment_slice_t *fss;
246 ssvm_shared_header_t *sh;
250 /* TODO remove ssvm heap entirely */
253 seg_data = (u8 *) sh + offset;
254 seg_size = sh->ssvm_size - offset;
256 seg_start = round_pow2_u64 (pointer_to_uword (seg_data), align);
257 fsh = uword_to_pointer (seg_start, void *);
258 memset (fsh, 0, sizeof (*fsh));
259 fsh->byte_index = sizeof (*fsh);
260 fsh->max_byte_index = seg_size;
261 fs->max_byte_index = fsh->max_byte_index;
262 ASSERT (fsh->max_byte_index <= sh->ssvm_va + sh->ssvm_size);
264 fs->h = sh->opaque[0] = fsh;
265 fs->n_slices = clib_max (fs->n_slices, 1);
267 fsh->n_slices = fs->n_slices;
269 clib_min ((fsh_n_free_bytes (fsh) - 4096) / 2, FIFO_SEGMENT_MAX_FIFO_SIZE);
270 fsh->max_log2_chunk_size = max_log2 (max_fifo);
272 fsh->slices = fsh_alloc (fsh, sizeof (*fss) * fs->n_slices);
273 memset (fsh->slices, 0, sizeof (*fss) * fs->n_slices);
274 max_chunk_sz = fsh->max_log2_chunk_size - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
277 for (i = 0; i < fs->n_slices; i++)
279 fss = fsh_slice_get (fsh, i);
280 vec_sz = max_chunk_sz * sizeof (*fss->free_chunks);
281 fss->free_chunks = fsh_alloc (fsh, vec_sz);
282 memset (fss->free_chunks, 0, vec_sz);
283 vec_sz = max_chunk_sz * sizeof (*fss->num_chunks);
284 fss->num_chunks = fsh_alloc (fsh, vec_sz);
285 memset (fss->num_chunks, 0, vec_sz);
288 fss->n_chunk_lens = max_chunk_sz;
291 fsh->n_cached_bytes = 0;
292 fsh->n_reserved_bytes = fsh->byte_index;
298 * Create a fifo segment and initialize as master
301 fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
307 /* Allocate a fresh segment */
308 pool_get_zero (sm->segments, fs);
310 baseva = a->segment_type == SSVM_SEGMENT_PRIVATE ? ~0ULL : sm->next_baseva;
311 fs->ssvm.ssvm_size = a->segment_size;
312 fs->ssvm.is_server = 1;
313 fs->ssvm.my_pid = getpid ();
314 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
315 fs->ssvm.requested_va = baseva;
317 if ((rv = ssvm_server_init (&fs->ssvm, a->segment_type)))
319 pool_put (sm->segments, fs);
323 /* Note: requested_va updated due to seg base addr randomization */
324 sm->next_baseva = fs->ssvm.sh->ssvm_va + fs->ssvm.ssvm_size;
326 fifo_segment_init (fs);
327 vec_add1 (a->new_segment_indices, fs - sm->segments);
332 * Attach as slave to a fifo segment
335 fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
340 pool_get_zero (sm->segments, fs);
342 fs->ssvm.ssvm_size = a->segment_size;
343 fs->ssvm.my_pid = getpid ();
344 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
345 fs->ssvm.requested_va = sm->next_baseva;
346 if (a->segment_type == SSVM_SEGMENT_MEMFD)
347 fs->ssvm.fd = a->memfd_fd;
349 fs->ssvm.attach_timeout = sm->timeout_in_seconds;
351 if ((rv = ssvm_client_init (&fs->ssvm, a->segment_type)))
353 _vec_len (fs) = vec_len (fs) - 1;
357 /* Fish the segment header */
358 fs->h = fs->ssvm.sh->opaque[0];
360 vec_add1 (a->new_segment_indices, fs - sm->segments);
365 fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
367 ssvm_delete (&s->ssvm);
368 clib_memset (s, 0xfe, sizeof (*s));
369 pool_put (sm->segments, s);
373 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
375 return s - sm->segments;
379 fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
381 return pool_elt_at_index (sm->segments, segment_index);
385 fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
387 *address = (char *) seg->ssvm.sh->ssvm_va;
388 *size = seg->ssvm.ssvm_size;
392 fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
393 u32 timeout_in_seconds)
395 sm->next_baseva = baseva;
396 sm->timeout_in_seconds = timeout_in_seconds;
400 fs_freelist_for_size (u32 size)
402 if (PREDICT_FALSE (size < FIFO_SEGMENT_MIN_FIFO_SIZE))
404 return max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
408 fs_freelist_index_to_size (u32 fl_index)
410 return 1 << (fl_index + FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE);
414 fs_chunk_size_is_valid (fifo_segment_header_t * fsh, u32 size)
417 * 4K minimum. It's not likely that anything good will happen
418 * with a smaller FIFO.
420 return size >= FIFO_SEGMENT_MIN_FIFO_SIZE
421 && size <= (1ULL << fsh->max_log2_chunk_size);
425 fs_try_alloc_multi_chunk (fifo_segment_header_t * fsh,
426 fifo_segment_slice_t * fss, u32 data_bytes)
428 u32 fl_index, fl_size, n_alloc = 0, req_bytes = data_bytes;
429 svm_fifo_chunk_t *c, *first = 0, *next;
431 fl_index = fs_freelist_for_size (req_bytes);
435 fl_size = fs_freelist_index_to_size (fl_index);
439 c = fss_chunk_free_list_pop (fss, fl_index);
445 req_bytes -= clib_min (fl_size, req_bytes);
449 /* Failed to allocate with smaller chunks */
452 /* Free all chunks if any allocated */
456 fl_index = fs_freelist_for_size (c->length);
458 fss_chunk_free_list_push (fss, fl_index, c);
463 /* As last attempt, try allocating a chunk larger than
464 * the requested size, if possible */
465 fl_index = fs_freelist_for_size (data_bytes) + 1;
466 if (!fss_chunk_fl_index_is_valid (fss, fl_index))
468 first = fss_chunk_free_list_pop (fss, fl_index);
472 n_alloc = fs_freelist_index_to_size (fl_index);
478 fl_size = fl_size >> 1;
483 fss_fl_chunk_bytes_sub (fss, n_alloc);
484 fsh_cached_bytes_sub (fsh, n_alloc);
489 fsh_try_alloc_fifo_hdr_batch (fifo_segment_header_t * fsh,
490 fifo_segment_slice_t * fss, u32 batch_size)
497 ASSERT (batch_size != 0);
499 size = (uword) sizeof (*f) * batch_size;
501 fmem = fsh_alloc_aligned (fsh, size, CLIB_CACHE_LINE_BYTES);
505 /* Carve fifo hdr space */
506 for (i = 0; i < batch_size; i++)
508 f = (svm_fifo_t *) fmem;
509 memset (f, 0, sizeof (*f));
510 f->next = fss->free_fifos;
519 fsh_try_alloc_chunk_batch (fifo_segment_header_t * fsh,
520 fifo_segment_slice_t * fss,
521 u32 fl_index, u32 batch_size)
523 svm_fifo_chunk_t *c, *head = 0, *tail;
524 uword size, total_chunk_bytes;
525 u32 rounded_data_size;
529 ASSERT (batch_size != 0);
531 rounded_data_size = fs_freelist_index_to_size (fl_index);
532 total_chunk_bytes = (uword) batch_size *rounded_data_size;
533 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
535 cmem = fsh_alloc_aligned (fsh, size, 8 /* chunk hdr is 24B */);
539 /* Carve fifo + chunk space */
540 tail = c = (svm_fifo_chunk_t *) cmem;
541 for (i = 0; i < batch_size; i++)
544 c->length = rounded_data_size;
547 cmem += sizeof (*c) + rounded_data_size;
548 c = (svm_fifo_chunk_t *) cmem;
551 fss_chunk_free_list_push_list (fss, fl_index, head, tail);
552 fss->num_chunks[fl_index] += batch_size;
553 fss_fl_chunk_bytes_add (fss, total_chunk_bytes);
554 fsh_cached_bytes_add (fsh, total_chunk_bytes);
560 fs_try_alloc_fifo_batch (fifo_segment_header_t * fsh,
561 fifo_segment_slice_t * fss,
562 u32 fl_index, u32 batch_size)
564 if (fsh_try_alloc_fifo_hdr_batch (fsh, fss, batch_size))
566 return fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch_size);
570 fsh_try_alloc_fifo_hdr (fifo_segment_header_t * fsh,
571 fifo_segment_slice_t * fss)
575 if (!fss->free_fifos)
577 if (fsh_try_alloc_fifo_hdr_batch (fsh, fss,
578 FIFO_SEGMENT_ALLOC_BATCH_SIZE))
583 fss->free_fifos = f->next;
584 memset (f, 0, sizeof (*f));
588 static svm_fifo_chunk_t *
589 fsh_try_alloc_chunk (fifo_segment_header_t * fsh,
590 fifo_segment_slice_t * fss, u32 data_bytes)
595 fl_index = fs_freelist_for_size (data_bytes);
598 c = fss_chunk_free_list_pop (fss, fl_index);
602 fss_fl_chunk_bytes_sub (fss, fs_freelist_index_to_size (fl_index));
603 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
607 u32 chunk_size, batch = FIFO_SEGMENT_ALLOC_BATCH_SIZE;
610 chunk_size = fs_freelist_index_to_size (fl_index);
611 n_free = fsh_n_free_bytes (fsh);
613 if (chunk_size <= n_free)
615 batch = chunk_size * batch <= n_free ? batch : 1;
616 if (!fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch))
619 /* Failed to allocate larger chunk, try to allocate multi-chunk
620 * that is close to what was actually requested */
621 if (data_bytes <= fss_fl_chunk_bytes (fss))
623 c = fs_try_alloc_multi_chunk (fsh, fss, data_bytes);
626 batch = n_free / FIFO_SEGMENT_MIN_FIFO_SIZE;
627 if (!batch || fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
630 if (data_bytes <= fss_fl_chunk_bytes (fss) + n_free)
632 u32 min_size = FIFO_SEGMENT_MIN_FIFO_SIZE;
634 batch = (data_bytes - fss_fl_chunk_bytes (fss)) / min_size;
635 batch = clib_min (batch + 1, n_free / min_size);
636 if (fsh_try_alloc_chunk_batch (fsh, fss, 0, batch))
638 c = fs_try_alloc_multi_chunk (fsh, fss, data_bytes);
648 * Try to allocate new fifo
650 * Tries the following steps in order:
651 * - grab fifo and chunk from freelists
652 * - batch fifo and chunk allocation
653 * - single fifo allocation
654 * - grab multiple fifo chunks from freelists
657 fs_try_alloc_fifo (fifo_segment_header_t * fsh, fifo_segment_slice_t * fss,
660 u32 fl_index, min_size;
664 min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096);
665 fl_index = fs_freelist_for_size (min_size);
667 if (!fss_chunk_fl_index_is_valid (fss, fl_index))
670 f = fsh_try_alloc_fifo_hdr (fsh, fss);
674 c = fsh_try_alloc_chunk (fsh, fss, min_size);
677 f->next = fss->free_fifos;
686 f->size = data_bytes;
693 fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size)
695 fifo_segment_slice_t *fss;
698 fss = fsh_slice_get (fsh, slice_index);
699 c = fsh_try_alloc_chunk (fsh, fss, chunk_size);
705 fsh_slice_collect_chunks (fifo_segment_header_t * fsh,
706 fifo_segment_slice_t * fss, svm_fifo_chunk_t * c)
708 u32 n_collect = 0, fl_index;
709 svm_fifo_chunk_t *next;
713 CLIB_MEM_UNPOISON (c, sizeof (*c));
715 fl_index = fs_freelist_for_size (c->length);
716 fss_chunk_free_list_push (fss, fl_index, c);
717 n_collect += fs_freelist_index_to_size (fl_index);
721 fss_fl_chunk_bytes_add (fss, n_collect);
722 fsh_cached_bytes_add (fsh, n_collect);
726 fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
727 svm_fifo_chunk_t * c)
729 fifo_segment_slice_t *fss;
730 fss = fsh_slice_get (fsh, slice_index);
731 fsh_slice_collect_chunks (fsh, fss, c);
735 * Allocate fifo in fifo segment
738 fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
739 u32 data_bytes, fifo_segment_ftype_t ftype)
741 fifo_segment_header_t *fsh = fs->h;
742 fifo_segment_slice_t *fss;
745 ASSERT (slice_index < fs->n_slices);
747 if (PREDICT_FALSE (data_bytes > 1 << fsh->max_log2_chunk_size))
750 fss = fsh_slice_get (fsh, slice_index);
751 f = fs_try_alloc_fifo (fsh, fss, data_bytes);
755 f->slice_index = slice_index;
757 svm_fifo_init (f, data_bytes);
759 /* If rx fifo type add to active fifos list. When cleaning up segment,
760 * we need a list of active sessions that should be disconnected. Since
761 * both rx and tx fifos keep pointers to the session, it's enough to track
763 if (ftype == FIFO_SEGMENT_RX_FIFO)
765 fss_fifo_add_active_list (fss, f);
766 f->flags |= SVM_FIFO_F_LL_TRACKED;
769 fsh_active_fifos_update (fsh, 1);
770 fss->virtual_mem += svm_fifo_size (f);
777 * Free fifo allocated in fifo segment
780 fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f)
782 fifo_segment_header_t *fsh = fs->h;
783 fifo_segment_slice_t *fss;
785 ASSERT (f->refcnt > 0);
790 fss = fsh_slice_get (fsh, f->slice_index);
792 /* Remove from active list. Only rx fifos are tracked */
793 if (f->flags & SVM_FIFO_F_LL_TRACKED)
795 fss_fifo_del_active_list (fss, f);
796 f->flags &= ~SVM_FIFO_F_LL_TRACKED;
799 /* Free fifo chunks */
800 fsh_slice_collect_chunks (fsh, fss, f->start_chunk);
802 f->start_chunk = f->end_chunk = 0;
803 f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = 0;
805 /* not allocated on segment heap */
806 svm_fifo_free_chunk_lookup (f);
807 svm_fifo_free_ooo_data (f);
811 f->master_session_index = ~0;
812 f->master_thread_index = ~0;
815 fss->virtual_mem -= svm_fifo_size (f);
817 /* Add to free list */
818 f->next = fss->free_fifos;
822 fsh_active_fifos_update (fsh, -1);
826 fifo_segment_detach_fifo (fifo_segment_t * fs, svm_fifo_t * f)
828 fifo_segment_slice_t *fss;
832 ASSERT (f->refcnt == 1);
834 fss = fsh_slice_get (fs->h, f->slice_index);
835 fss->virtual_mem -= svm_fifo_size (f);
836 if (f->flags & SVM_FIFO_F_LL_TRACKED)
837 fss_fifo_del_active_list (fss, f);
842 fl_index = fs_freelist_for_size (c->length);
843 clib_atomic_fetch_sub_rel (&fss->num_chunks[fl_index], 1);
849 fifo_segment_attach_fifo (fifo_segment_t * fs, svm_fifo_t * f,
852 fifo_segment_slice_t *fss;
856 f->slice_index = slice_index;
857 fss = fsh_slice_get (fs->h, f->slice_index);
858 fss->virtual_mem += svm_fifo_size (f);
859 if (f->flags & SVM_FIFO_F_LL_TRACKED)
860 fss_fifo_add_active_list (fss, f);
865 fl_index = fs_freelist_for_size (c->length);
866 clib_atomic_fetch_add_rel (&fss->num_chunks[fl_index], 1);
872 fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
875 fifo_segment_header_t *fsh = fs->h;
876 fifo_segment_slice_t *fss;
878 fss = fsh_slice_get (fsh, slice_index);
879 return fsh_try_alloc_fifo_hdr_batch (fsh, fss, batch_size);
883 fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
884 u32 chunk_size, u32 batch_size)
886 fifo_segment_header_t *fsh = fs->h;
887 fifo_segment_slice_t *fss;
890 if (!fs_chunk_size_is_valid (fsh, chunk_size))
892 clib_warning ("chunk size out of range %d", chunk_size);
896 fl_index = fs_freelist_for_size (chunk_size);
897 fss = fsh_slice_get (fsh, slice_index);
899 return fsh_try_alloc_chunk_batch (fsh, fss, fl_index, batch_size);
903 * Pre-allocates fifo pairs in fifo segment
906 fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
907 u32 rx_fifo_size, u32 tx_fifo_size,
910 u32 rx_rounded_data_size, tx_rounded_data_size, pair_size, pairs_to_alloc;
911 u32 hdrs, pairs_per_slice, alloc_now;
912 fifo_segment_header_t *fsh = fs->h;
913 int rx_fl_index, tx_fl_index, i;
914 fifo_segment_slice_t *fss;
915 uword space_available;
917 /* Parameter check */
918 if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
921 if (!fs_chunk_size_is_valid (fsh, rx_fifo_size))
923 clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
927 if (!fs_chunk_size_is_valid (fsh, tx_fifo_size))
929 clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
933 rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
934 rx_fl_index = fs_freelist_for_size (rx_fifo_size);
935 tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
936 tx_fl_index = fs_freelist_for_size (tx_fifo_size);
938 hdrs = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
940 /* Calculate space requirements */
941 pair_size = 2 * hdrs + rx_rounded_data_size + tx_rounded_data_size;
942 space_available = fsh_n_free_bytes (fsh);
943 pairs_to_alloc = space_available / pair_size;
944 pairs_to_alloc = clib_min (pairs_to_alloc, *n_fifo_pairs);
945 pairs_per_slice = pairs_to_alloc / fs->n_slices;
946 pairs_per_slice += pairs_to_alloc % fs->n_slices ? 1 : 0;
948 if (!pairs_per_slice)
951 for (i = 0; i < fs->n_slices; i++)
953 alloc_now = clib_min (pairs_per_slice, *n_fifo_pairs);
957 fss = fsh_slice_get (fsh, i);
958 if (fs_try_alloc_fifo_batch (fsh, fss, rx_fl_index, alloc_now))
959 clib_warning ("rx prealloc failed: pairs %u", alloc_now);
960 if (fs_try_alloc_fifo_batch (fsh, fss, tx_fl_index, alloc_now))
961 clib_warning ("tx prealloc failed: pairs %u", alloc_now);
963 /* Account for the pairs allocated */
964 *n_fifo_pairs -= alloc_now;
969 * Get number of active fifos
972 fifo_segment_num_fifos (fifo_segment_t * fs)
974 return fsh_n_active_fifos (fs->h);
978 fs_slice_num_free_fifos (fifo_segment_slice_t * fss)
996 fifo_segment_num_free_fifos (fifo_segment_t * fs)
998 fifo_segment_header_t *fsh = fs->h;
999 fifo_segment_slice_t *fss;
1003 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1005 fss = fsh_slice_get (fsh, slice_index);
1006 count += fs_slice_num_free_fifos (fss);
1012 fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
1014 u32 count = 0, rounded_size, fl_index;
1015 svm_fifo_chunk_t *c;
1018 /* Count all free chunks? */
1021 for (i = 0; i < fss->n_chunk_lens; i++)
1023 c = fss->free_chunks[i];
1036 rounded_size = (1 << (max_log2 (size)));
1037 fl_index = fs_freelist_for_size (rounded_size);
1039 if (fl_index >= fss->n_chunk_lens)
1042 c = fss->free_chunks[fl_index];
1055 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size)
1057 fifo_segment_header_t *fsh = fs->h;
1058 fifo_segment_slice_t *fss;
1062 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1064 fss = fsh_slice_get (fsh, slice_index);
1065 count += fs_slice_num_free_chunks (fss, size);
1071 fifo_segment_size (fifo_segment_t * fs)
1073 return fs->h->max_byte_index - fs->h->n_reserved_bytes;
1077 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh)
1079 return (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT) ? 1 : 0;
1083 fsh_reset_mem_limit (fifo_segment_header_t * fsh)
1085 fsh->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
1089 fifo_segment_alloc (fifo_segment_t *fs, uword size)
1091 void *rv = fsh_alloc (fs->h, size);
1092 /* Mark externally allocated bytes as reserved. This helps
1093 * @ref fifo_segment_size report bytes used only for fifos */
1094 fs->h->n_reserved_bytes += size;
1099 fifo_segment_free_bytes (fifo_segment_t * fs)
1101 return fsh_n_free_bytes (fs->h);
1105 fifo_segment_cached_bytes (fifo_segment_t * fs)
1107 return fsh_n_cached_bytes (fs->h);
1111 fifo_segment_available_bytes (fifo_segment_t * fs)
1113 return fsh_n_free_bytes (fs->h) + fsh_n_cached_bytes (fs->h);
1117 fifo_segment_fl_chunk_bytes (fifo_segment_t * fs)
1119 fifo_segment_header_t *fsh = fs->h;
1120 fifo_segment_slice_t *fss;
1124 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1126 fss = fsh_slice_get (fsh, slice_index);
1127 n_bytes += fss_fl_chunk_bytes (fss);
1134 fifo_segment_has_fifos (fifo_segment_t * fs)
1136 return (fsh_n_active_fifos (fs->h) != 0);
1140 fifo_segment_get_slice_fifo_list (fifo_segment_t * fs, u32 slice_index)
1142 fifo_segment_header_t *fsh = fs->h;
1143 fifo_segment_slice_t *fss;
1145 fss = fsh_slice_get (fsh, slice_index);
1150 fifo_segment_get_mem_usage (fifo_segment_t * fs)
1154 size = fifo_segment_size (fs);
1156 size - fifo_segment_free_bytes (fs) - fifo_segment_cached_bytes (fs);
1157 return (in_use * 100) / size;
1160 fifo_segment_mem_status_t
1161 fifo_segment_determine_status (fifo_segment_header_t * fsh, u8 usage)
1163 if (!fsh->high_watermark || !fsh->low_watermark)
1164 return MEMORY_PRESSURE_NO_PRESSURE;
1166 /* once the no-memory is detected, the status continues
1167 * until memory usage gets below the high watermark
1169 if (fsh_has_reached_mem_limit (fsh))
1171 if (usage >= fsh->high_watermark)
1172 return MEMORY_PRESSURE_NO_MEMORY;
1174 fsh_reset_mem_limit (fsh);
1177 if (usage >= fsh->high_watermark)
1178 return MEMORY_PRESSURE_HIGH_PRESSURE;
1180 else if (usage >= fsh->low_watermark)
1181 return MEMORY_PRESSURE_LOW_PRESSURE;
1183 return MEMORY_PRESSURE_NO_PRESSURE;
1186 fifo_segment_mem_status_t
1187 fifo_segment_get_mem_status (fifo_segment_t * fs)
1189 fifo_segment_header_t *fsh = fs->h;
1190 u8 usage = fifo_segment_get_mem_usage (fs);
1192 return fifo_segment_determine_status (fsh, usage);
1196 format_fifo_segment_type (u8 * s, va_list * args)
1199 sp = va_arg (*args, fifo_segment_t *);
1200 ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
1202 if (st == SSVM_SEGMENT_PRIVATE)
1203 s = format (s, "%s", "private");
1204 else if (st == SSVM_SEGMENT_MEMFD)
1205 s = format (s, "%s", "memfd");
1206 else if (st == SSVM_SEGMENT_SHM)
1207 s = format (s, "%s", "shm");
1209 s = format (s, "%s", "unknown");
1214 * Segment format function
1217 format_fifo_segment (u8 * s, va_list * args)
1219 u32 count, indent, active_fifos, free_fifos;
1220 fifo_segment_t *fs = va_arg (*args, fifo_segment_t *);
1221 int verbose __attribute__ ((unused)) = va_arg (*args, int);
1222 uword est_chunk_bytes, est_free_seg_bytes, free_chunks;
1223 uword chunk_bytes = 0, free_seg_bytes, chunk_size;
1224 uword tracked_cached_bytes;
1225 uword fifo_hdr = 0, reserved;
1226 fifo_segment_header_t *fsh;
1227 fifo_segment_slice_t *fss;
1228 svm_fifo_chunk_t *c;
1233 uword allocated, in_use, virt;
1235 fifo_segment_mem_status_t mem_st;
1237 indent = format_get_indent (s) + 2;
1241 s = format (s, "%-20s%10s%15s%15s%15s%15s", "Name", "Type",
1242 "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
1246 fifo_segment_info (fs, &address, &size);
1247 active_fifos = fifo_segment_num_fifos (fs);
1248 free_fifos = fifo_segment_num_free_fifos (fs);
1250 s = format (s, "%-20v%10U%15llu%15u%15u%15llx", ssvm_name (&fs->ssvm),
1251 format_fifo_segment_type, fs, size >> 20ULL, active_fifos,
1252 free_fifos, address);
1259 free_chunks = fifo_segment_num_free_chunks (fs, ~0);
1262 format (s, "\n\n%UFree/Allocated chunks by size:\n", format_white_space,
1265 s = format (s, "\n");
1267 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1269 fss = fsh_slice_get (fsh, slice_index);
1270 for (i = 0; i < fss->n_chunk_lens; i++)
1272 c = fss->free_chunks[i];
1273 if (c == 0 && fss->num_chunks[i] == 0)
1282 chunk_size = fs_freelist_index_to_size (i);
1283 s = format (s, "%U%-5u kB: %u/%u\n", format_white_space, indent + 2,
1284 chunk_size >> 10, count, fss->num_chunks[i]);
1286 chunk_bytes += count * chunk_size;
1290 fifo_hdr = free_fifos * sizeof (svm_fifo_t);
1291 est_chunk_bytes = fifo_segment_fl_chunk_bytes (fs);
1292 est_free_seg_bytes = fifo_segment_free_bytes (fs);
1293 free_seg_bytes = fifo_segment_free_bytes (fs);
1294 tracked_cached_bytes = fifo_segment_cached_bytes (fs);
1295 allocated = fifo_segment_size (fs);
1296 in_use = fifo_segment_size (fs) - est_free_seg_bytes - tracked_cached_bytes;
1297 usage = (100.0 * in_use) / allocated;
1298 mem_st = fifo_segment_get_mem_status (fs);
1299 virt = fsh_virtual_mem (fsh);
1300 reserved = fsh->n_reserved_bytes;
1302 s = format (s, "\n%Useg free bytes: %U (%lu) estimated: %U (%lu) reserved:"
1303 " %U (%lu)\n", format_white_space, indent + 2,
1304 format_memory_size, free_seg_bytes, free_seg_bytes,
1305 format_memory_size, est_free_seg_bytes, est_free_seg_bytes,
1306 format_memory_size, reserved, reserved);
1307 s = format (s, "%Uchunk free bytes: %U (%lu) estimated: %U (%lu) tracked:"
1308 " %U (%lu)\n", format_white_space, indent + 2,
1309 format_memory_size, chunk_bytes, chunk_bytes,
1310 format_memory_size, est_chunk_bytes, est_chunk_bytes,
1311 format_memory_size, tracked_cached_bytes, tracked_cached_bytes);
1312 s = format (s, "%Ufifo active: %u hdr free bytes: %U (%u) \n",
1313 format_white_space, indent + 2, fsh->n_active_fifos,
1314 format_memory_size, fifo_hdr, fifo_hdr);
1315 s = format (s, "%Usegment usage: %.2f%% (%U / %U) virt: %U status: %s\n",
1316 format_white_space, indent + 2, usage, format_memory_size,
1317 in_use, format_memory_size, allocated, format_memory_size, virt,
1318 fifo_segment_mem_status_strings[mem_st]);
1319 s = format (s, "\n");
1325 * fd.io coding-style-patch-verification: ON
1328 * eval: (c-set-style "gnu")